Browse-In-Books.com

Look Inside and Search Inside Books.
In Association with Amazon.com
Look Inside the Book is a feature that allows you to read a few sample pages from a large number of titles. This way, you can see if you like what you're reading before you buy.

Search Inside the Book allows you to search millions of pages to find exactly the book you want to buy. You can even preview the pages of any particular book. For more on how to use the Search Inside the Book feature, visit the How it Works page. Now instead of just displaying books whose title, author, or publisher-provided keywords match your search terms, your search results will surface titles based on every word inside the book.

It is FREE.
No fees for using the Search Inside the Book feature.
Search Inside the Book FAQs.